Current Foldback Protection (Disabled at Start-Up)
Pb-Free (e4) RoHS Compliant Package with Gold
Finish Pads
UltraFast™ Transient Response
Current Mode Control
Up to 95% Efficiency at 5V
IN
, 3.3V
OUT
Programmable Soft-Start
Output Overvoltage Protection
Enhanced (15mm
×
15mm
×
2.8mm) Surface Mount
LGA Package
APPLICATIONS
n
n
Telecom and Networking Equipment
Servers
TYPICAL APPLICATION
1.5V/12A Power Supply with 4.5V to 20V Input
V
IN
4.5V TO 20V
V
IN
PGOOD
ON/OFF
C
IN
RUN
COMP
INTV
CC
DRV
CC
MPGM
SGND
PLLIN TRACK/SS
V
OUT
V
FB
MARG0
MARG1
V
OUT_LCL
DIFFV
OUT
V
OSNS+
V
OSNS–
f
SET
R
SET
40.2k
4601A TA01a
Efficiency and Power Loss
vs Load Current
95
EFFICIENCY
90
V
OUT
1.5V
12A
85
EFFICIENCY (%)
80
75
70
65
60
POWER LOSS
55
50
0
2
4
6
8
10
LOAD CURRENT (A)
12
14
1.0
0.5
12V
IN
5V
IN
2.0
1.5
5V
IN
3.5
12V
IN
3.0
2.5
4.0
CLOCK SYNC
TRACK/SS CONTROL
POWER LOSS (W)
100pF
MARGIN
CONTROL
LTM4601A
C
OUT
R1
392k
5% MARGIN
PGND
4601A TA01b
4601afb
1
LTM4601A/LTM4601A-1
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
(See Table 5. Pin Assignment)
TOP VIEW
INTV
CC
PLLIN
TRACK/SS
RUN
COMP
MPGM
MTP1
INTV
CC
PGND
MTP2
MTP3
f
SET
MARG0
MARG1
DRV
CC
V
FB
PGOOD
SGND
V
OSNS+
/NC2*
DIFFV
OUT
/NC3*
V
OUT_LCL
V
OSNS–
/NC1*
INTV
CC
, DRV
CC
, V
OUT_LCL
, V
OUT
(V
OUT
≤ 3.3V with
DIFFV
OUT
)..................................................... –0.3V to 6V
PLLIN, TRACK/SS, MPGM, MARG0, MARG1,
PGOOD, f
SET
..............................–0.3V to INTV
CC
+ 0.3V
RUN ............................................................. –0.3V to 5V
V
FB
, COMP ................................................ –0.3V to 2.7V
V
IN
............................................................. –0.3V to 20V
V
OSNS+
, V
OSNS–
..........................–0.3V to INTV
CC
+ 0.3V
Operating Temperature Range (Note 2).... –40°C to 85°C
Junction Temperature ........................................... 125°C
Storage Temperature Range...................–55°C to 125°C
V
IN
V
OUT
LGA PACKAGE
133-LEAD (15mm
×
15mm
×
2.8mm)
T
JMAX
= 125°C,
θ
JA
= 15°C/W,
θ
JC
= 6°C/W,
θ
JA
DERIVED FROM 95mm
×
76mm PCB WITH 4 LAYERS
WEIGHT = 1.7g
*LTM4601A-1 ONLY
ORDER INFORMATION
LEAD FREE FINISH
LTM4601AEV#PBF
LTM4601AIV#PBF
LTM4601AEV-1#PBF
LTM4601AIV-1#PBF
TRAY
LTM4601AEV#PBF
LTM4601AIV#PBF
LTM4601AEV-1#PBF
LTM4601AIV-1#PBF
PART MARKING*
LTM4601AV
LTM4601AV
LTM4601AV-1
LTM4601AV-1
PACKAGE DESCRIPTION
133-Lead (15mm
×
15mm
×
2.8mm) LGA
133-Lead (15mm
×
15mm
×
2.8mm) LGA
133-Lead (15mm
×
15mm
×
2.8mm) LGA
133-Lead (15mm
×
15mm
×
2.8mm) LGA
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
This product is only offered in trays. For more information go to: http://www.linear.com/packaging/
The
l
denotes the specifications which apply over the –40°C to 85°C
temperature range, otherwise specifications are at T
A
= 25°C, V
IN
= 12V. Per typical application (front page) configuration.
SYMBOL
V
IN(DC)
V
OUT(DC)
PARAMETER
Input DC Voltage
Output Voltage, Total Variation with
Line and Load
Undervoltage Lockout Threshold
Input Inrush Current at Startup
C
IN
= 10μF
×3,
C
OUT
= 200μF, R
SET
= 40.2k
V
IN
= 5V to 20V, I
OUT
= 0A to 12A (Note 5)
I
OUT
= 0A
I
OUT
= 0A. V
OUT
= 1.5V
V
IN
= 5V
V
IN
= 12V
CONDITIONS
l
l
ELECTRICAL CHARACTERISTICS
MIN
4.5
1.478
TYP
MAX
20
UNITS
V
V
V
A
A
1.5
3.2
0.6
0.7
1.522
4
Input Specifications
V
IN(UVLO)
I
INRUSH(VIN)
4601afb
2
LTM4601A/LTM4601A-1
ELECTRICAL CHARACTERISTICS
SYMBOL
I
Q(VIN,NOLOAD)
PARAMETER
Input Supply Bias Current
The
l
denotes the specifications which apply over the – 40°C to 85°C
temperature range, otherwise specifications are at T
A
= 25°C, V
IN
= 12V. Per typical application (front page) configuration.
CONDITIONS
V
IN
= 12V, No Switching
V
IN
= 12V, V
OUT
= 1.5V, Switching Continuous
V
IN
= 5V, No Switching
V
IN
= 5V, V
OUT
= 1.5V, Switching Continuous
Shutdown, RUN = 0, V
IN
= 12V
V
IN
= 12V, V
OUT
= 1.5V, I
OUT
= 12A
V
IN
= 12V, V
OUT
= 3.3V, I
OUT
= 12A
V
IN
= 5V, V
OUT
= 1.5V, I
OUT
= 12A
No Load
V
IN
= 12V, V
OUT
= 1.5V (Note 5)
V
OUT
= 1.5V, I
OUT
= 0A, V
IN
from 4.5V to 20V
V
OUT
= 1.5V, 0A to 12A (Note 5)
V
IN
= 12V, with Remote Sense Amplifier
V
IN
= 12V (LTM4601A-1)
I
OUT
= 0A, C
OUT
= 2×, 100μF X5R Ceramic
V
IN
= 12V, V
OUT
= 1.5V
V
IN
= 5V, V
OUT
= 1.5V
I
OUT
= 5A, V
IN
= 12V, V
OUT
= 1.5V
C
OUT
= 200μF, V
OUT
= 1.5V, I
OUT
= 0A
V
IN
= 12V
V
IN
= 5V
C
OUT
= 200μF, V
OUT
= 1.5V, I
OUT
= 1A Resisitive
Load
V
IN
= 12V
V
IN
= 5V
Load: 0% to 50% to 0% of Full Load,
C
OUT
= 2
×
22μF Ceramic, 470μF 4V Sanyo
POSCAP
V
IN
= 12V
V
IN
= 5V
l
MIN
TYP
3.8
38
2.5
42
22
1.81
3.63
4.29
MAX
UNITS
mA
mA
mA
mA
μA
A
A
A
I
S(VIN)
Input Supply Current
INTV
CC
I
OUTDC
ΔV
OUT(LINE)
V
OUT
ΔV
OUT(LOAD)
V
OUT
V
OUT(AC)
V
IN
= 12V, RUN > 2V
Output Continuous Current Range
Line Regulation Accuracy
Load Regulation Accuracy
4.7
0
5
5.3
12
0.3
V
A
%
Output Specifications
l
l
0.25
1
20
18
850
20
20
%
%
mV
P-P
mV
P-P
kHz
mV
mV
Output Ripple Voltage
f
S
ΔV
OUT(START)
Output Ripple Voltage Frequency
Turn-On Overshoot,
TRACK/SS = 10nF
Turn-On Time, TRACK/SS = Open
t
START
0.5
0.5
ms
ms
ΔV
OUTLS
Peak Deviation for Dynamic Load
35
35
25
17
17
0
0
1
3
INTV
CC
– 1
INTV
CC
1.25
mV
mV
μs
A
A
V
V
mV
V/V
MHz
t
SETTLE
I
OUTPK
Settling Time for Dynamic Load Step Load: 0% to 50%, or 50% to 0% of Full Load
V
IN
= 12V
Output Current Limit
C
OUT
= 200μF, Table 2
V
IN
= 12V, V
OUT
= 1.5V
V
IN
= 5V, V
OUT
= 1.5V
Remote Sense Amp (Note 3) (LTM4601A Only, Not Supported in the LTM4601A-1)
V
OSNS+
, V
OSNS–
CM Range
DIFFV
OUT
Range
V
OS
A
V
GBP
Common Mode Input Voltage Range V
IN
= 12V, RUN > 2V
Output Voltage Range
Input Offset Voltage Magnitude
Differential Gain
Gain-Bandwidth Product
V
IN
= 12V, DIFF OUT Load = 100k
4601afb
3
LTM4601A/LTM4601A-1
ELECTRICAL CHARACTERISTICS
SYMBOL
SR
R
IN
CMRR
Control Stage
V
FB
V
RUN
I
SS/TRACK
t
ON(MIN)
t
OFF(MIN)
R
PLLIN
I
DRVCC
R
FBHI
V
MPGM
V
MARG0
, V
MARG1
PGOOD Output
ΔV
FBH
ΔV
FBL
ΔV
FB(HYS)
V
PGL
PGOOD Upper Threshold
PGOOD Lower Threshold
PGOOD Hysteresis
PGOOD Low Voltage
V
FB
Rising
V
FB
Falling
V
FB
Returning
I
PGOOD
= 5mA
7
–7
10
–10
1.5
0.15
0.4
13
–13
%
%
%
V
Error Amplifier Input Voltage
Accuracy
RUN Pin On/Off Threshold
Soft-Start Charging Current
Minimum On-Time
Minimum Off-Time
PLLIN Input Resistance
Current into DRV
CC
Pin
Resistor Between V
OUT_LCL
and V
FB
Margin Reference Voltage
MARG0, MARG1 Voltage Thresholds
V
OUT
= 1.5V, I
OUT
= 1A, DRV
CC
= 5V
60.098
V
SS/TRACK
= 0V
(Note 4)
(Note 4)
I
OUT
= 0A, V
OUT
= 1.5V
l
The
l
denotes the specifications which apply over the –40°C to 85°C
temperature range, otherwise specifications are at T
A
= 25°C, V
IN
= 12V. Per typical application (front page) configuration.
PARAMETER
Slew Rate
Input Resistance
Common Mode Rejection Mode
0.594
1
–1
V
OSNS+
to GND
CONDITIONS
MIN
TYP
2
20
100
0.6
1.5
–1.5
50
250
50
18
60.4
1.18
1.4
25
60.702
0.606
1.9
–2
100
400
MAX
UNITS
V/μs
kΩ
dB
V
V
μA
ns
ns
kΩ
mA
kΩ
V
V
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
The LTM4601AE/LTM4601AE-1 are guaranteed to meet
performance specifications from 0°C to 85°C. Specifications over the
–40°C to 85°C operating temperature range are assured by design,
characterization and correlation with statistical process controls. The
LTM4601AI/LTM4601AI-1 are guaranteed and tested over the –40°C to
85°C temperature range.
Note 3:
Remote sense amplifier recommended for ≤3.3V output.
Note 4:
100% tested at wafer level only.
Note 5:
See Output Current Derating curves for different V
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